This is because all water-based materials have been removed and replaced with bake & cake friendly oils; these oils mix through much better than water-based gels (which we know water repels from the oils in your baking).
Edible Food Colouring Mill Violet Oil Based 20ml Cake Decorating Sugarcraft
Colour Mill Oil Blend Food Colouring Violet: Next Generation Oil Based Food Colours - 20 ml
Colour Mill Violet - Next Generation Oil Based Food Colouring for Baking, Decorating, Icing and Cooking Food Dye DIY Slime and Crafts - 20 ml
The Baked Studio Colour Mill Oil Based Food Colouring Gift Set - Tiffany Violet Fuchsia Hot Pink Cany Peach - Buttercream Fondant Sugarpaste Icing and Chocolate Colour (Fairytale), 120ml
Oil Based Food Colouring for Chocolate - Vibrant Fat Soluble Food Colouring for Candy Melts, Baking, Cake Decorating - Upgraded Edible Food Colour Dye for Icing, Fondant, DIY Crafts - 60ml (Violet)
Oil Based Food Colouring 30ml - Violet